<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>按钮边框动画</title>
		<link rel="stylesheet" href="./css/border.css" />
	</head>
	<body>
		<div class="box">
			<button class="btn">边框按钮</button>
		</div>
	</body>
</html>

